#0340B9
Closest named color: Blue Blue (#2242C7). oklch(42.8% 0.198 262.3), rgb(3, 64, 185).
Aa
White text reads best on this color (8.61:1).
About this color
#0340B9 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.198 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.030 away. White text reads best on it, at 8.61:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.43:1 |
| White text | 8.61:1 |
Values
| HEX | #0340B9 |
| RGB | rgb(3, 64, 185) |
| HSL | hsl(220, 97%, 37%) |
| OKLCH | oklch(42.8% 0.198 262.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #0340B9 | 8.61:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #0340B9 | 2.43:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #0340B9 text on white | 8.61:1 | AAA | Lc 88.5 | Fine for body text |
| #0340B9 text on black | 2.43:1 | Fails | Lc -13.7 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400
#6B9EFF
oklch(70.7% 0.153 262.2)
-
Step 500
500
#4382FF
oklch(63.2% 0.197 262.2)
-
Step 600
600
#1261FF
oklch(55.6% 0.245 262.3)
-
Step 700
700
#004DE1
oklch(49% 0.233 262.3)
-
Step 800
800 (this color)
#0340B9
oklch(42.8% 0.198 262.3)
-
Step 900
900
#0D3892
oklch(37.7% 0.156 262.5)
-
Step 950
950
#092255
oklch(26.9% 0.098 262.3)
#0340B9 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #0054BD | 0.049 |
| Deuteranopia (no green cones) | #0044B7 | 0.009 |
| Tritanopia (no blue cones) | #006177 | 0.150 |
| Achromatopsia (no color) | #4C4C4C | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0340B9
#0340B9
oklch(42.8% 0.198 262.3)
- #674A00
#674A00
oklch(42.9% 0.088 82.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #0340B9, closest first.
No curated palette has a color within ΔE 0.04 of #0340B9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.030
- Sapphire #2138AB ΔE 0.031
- Majorelle Blue #3F37C9 ΔE 0.057
- Cobalt #1E488F ΔE 0.073
- True Blue #010FCC ΔE 0.073
- Indigo Blue #3A18B1 ΔE 0.076
- Ultramarine Blue #1805DB ΔE 0.080
- Medium Blue #0000CD ΔE 0.081
Use #0340B9 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.